<div id="map"></div>
<script>
    var map = new mapboxgl.Map({
        container: 'map',
        style: 'mapbox://styles/mapbox/streets-v11',
        center: [-96, 37.8],
        zoom: 3
    });

    var popup = new mapboxgl.Popup({ closeOnClick: false })
        .setLngLat([-96, 37.8])
        .setHTML('<h1>Hello World!</h1>')
        .addTo(map);
</script>
